#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>


#define LEDOFF 0
#define LEDON  1

int main(int argc,char *argv[])
{
	int fd,retvalue;
	char *filename;
	unsigned char databuf[1];
	if(argc != 3)
	{
		printf("Error Usage\r\n");
	}
	filename = argv[1];
	fd = open(filename,O_RDWR);
	if(fd<0)
	{
		printf("file & open failed\r\n",filename);
	}
	databuf[0] = atoi(argv[2]);//将字符转换成数字
	retvalue = write(fd,databuf,sizeof(databuf));
	if(retvalue <0)
	{
		printf("LED control fail\r\n");
		close(fd);
		return -1;
	}
	close(fd);
	return 0;
}
